Livestock Dry-Matter Intake and As-Fed Ration
Dry-matter intake (body weight x intake %) restated as as-fed bunk weight at the feed dry-matter content.
Example
You enter
- Body weight (lb) 1200
- Dry-matter intake (% of body weight) 2.5
- Feed dry matter (%; 88 hay, 35 silage) 88
- Number of animals 1
You get
- Dry-matter intake 30
- As-fed intake 34.1
Checked against published worked examples from: University of Nebraska-Lincoln Beef (R. Rasby).
Details, formula, and sources
ScopeDry-matter intake (body weight x intake %) restated as as-fed bunk weight at the feed dry-matter content, and a herd total. Wet feeds weigh far more as-fed for the same nutrition. A nutritionist governs the ration.
Formula or tableDMI = BW x intake/100; as_fed = DMI / (feed_DM/100); herd_as_fed = as_fed x head.
Source and editionThe NRC Nutrient Requirements dry-matter-intake basis, by name.
Free accessDry-matter-intake guidelines are published by NRC (National Research Council) and land-grant extension. A ration balancer and a nutritionist govern the actual diet.
What governsEstimate. AHJ and licensed professional govern.
API field namesBW_lb, intake, feed_DM, head, DMI_lb, asfed_lb
- Dry-matter basis DMI = BW x intake%, always figured on a dry-matter basisNRC Nutrient Requirements
- As-fed conversion as_fed = DMI / (feed dry-matter fraction); wet feeds weigh far more as-fedNRC / extension
- Single feed only not a balanced ration; no energy/protein/mineral balancingscope of this tile